Improvement in permutation locks



JOH N FARREL.

Improvement in Permutation Locks,

Patented April 16, 1872.

AM. Fri am: mvasknnmr co. 1/, y lassanm'lc ma crux able wheels or disks.

JOHN FARREL, OF NEW YORK, N. Y.

IMPRQVEMEN'T IN PERM UTATlON LOCKS.

Specification forming part of Letters Patent No. 125,669, dated April 16, 1872.

To all whom it may concern:

Be it known that I, JOHN FARREL, of the State, city, and county of New York, have inven ted certain Improvements in Safe andBank Locks; and the following is a specification thereof.

This invention relates to that description of lock for safes wherein the tumblers are revolv- My improvement consists chiefly in the combination of wheel-tun1- blers with the fence of a latch-bolt, and with a bearer or bridge and intervened springs, whereby the bolt is provided with an elastic support, and the fence is prevented from entering the notches in the tumblers until the proper time, substantially as hereinafter described.

To enable others to comprehend and use my invention, Iwill proceed to describe the same, referring to the annexed drawing, wherein Fig. l is an interior view of the look as seen from the back, and Fig. 2 is a vertical transverse section.

A represents the lock case. B B are latchbolts, arranged within the same case, and each furnished with a separate mechanism for'locking and unlocking the bolts, consisting chiefly of a series of disks or wheel-tumblers, 0, arranged for rotation on a common axis, and otherwise so constructed as to be susceptible of the changes which characterize what are known as changeable looks. The tumblers represented have suitable notches, one to each, in their peripheries, to match a projection, E, termed a fence. Such fence is permanently fixed to the lower bolt B; but in the case of the upper bolt B the fence is made fast in a hinged bar, B which is connected with the bolt B by means of a link, L. Said bolt or bolts, in looking and unlocking, are lifted and lowered by a cam or cams, G, on an operatingshaft, H, and when locked engage with suitable studs F, (dotted) They may, however, be

released or disengaged only when the respective notchesiare all brought opposite the fence, and it then drops'with the bolt by admission in said notches, such fence, while the bolt remains locked, tending to gravitate and rest on the peripheries of one or more of the tumblers.

Now, to support the bolt and hold it away from contact with the tumblers while revolving, in order that the position of the notches may not be ascertained by turning the tumblers and using the weight of the bolt to indicate such position, I provide a bridge or bearer, J arranged to rest on the cam G and between the bolt or bar B and the bearer I introduce springs K,.-on which the bolt rests, and is thereby upborne and held away from the tumblers at all times, excepting when the flat sides of the cams are uppermost. When the cam or cams G are turned so as to raise the bearer the springs Kare compressed, and when turned .so as to lower it the resilience of the springs prevents the bolt from immediately obeying operating-shaft and tumblers.

brating latch-bolt, a series of wheel-tumblers,

and a revolving cam or cams, G, the parts bemg arranged and operating substantially as and for the purposes specified.

JOHN FARREL.

' Witnesses:

EARLE H. SMITH, JOHN L. Ronnnrs, Jr. 

